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Contingencies and Guaranty (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Apr. 30, 2023 USD ($) | Oct. 31, 2022 state | Feb. 28, 2021 USD ($) | Jun. 30, 2025 USD ($) | Sep. 30, 2025 USD ($) county country | Sep. 30, 2024 USD ($) county | Mar. 31, 2025 USD ($) country | Nov. 30, 2024 USD ($) | Mar. 31, 2024 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent liability |  |  |  |  |  |  | $ 8,802 |  | $ 8,093 |  |
Payments to acquire intangible assets |  |  |  |  |  |  | $ 17,147 | $ 10,904 |  |  |
Broadband licenses granted, number of counties | county |  |  |  |  |  |  | 161 | 1 |  |  |
Decrease in contingent liability |  |  |  |  |  |  | $ (7,425) | $ (10,000) |  |  |
Contract with customer liability | $ 128,214 | $ 120,687 |  |  |  | $ 128,214 | 130,416 | 126,627 | $ 124,672 |  | $ 122,212
Employer contribution amount |  |  |  |  |  |  | 200 | $ 300 |  |  |
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Wireless Licenses |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred | $ 28,000 |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum | Wireless Licenses |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract with customer liability |  |  |  |  |  |  | 22,500 |  |  |  |
Lower Colorado River Authority (LCRA) | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-term contingent consideration |  |  |  |  |  |  | 800 |  |  |  |
Long-term contingent consideration |  |  |  |  |  |  | 7,100 |  |  |  |
Lower Colorado River Authority (LCRA) | Licensing Agreements |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent liability |  |  |  |  |  |  |  |  |  | $ 1,400 |
Payments to acquire intangible assets |  |  | $ 30,000 |  |  |  |  |  |  |  |
Lower Colorado River Authority | Licensing Agreements |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire intangible assets |  |  |  |  |  |  | $ 13,600 |  |  |  |
Broadband licenses granted, number of counties | county |  |  |  |  |  |  | 50 |  |  |  |
Decrease in contingent liability |  |  |  |  |  |  | $ 14,900 |  |  |  |
Broadband license narrowband spectrum licenses previously received |  |  |  |  |  |  | $ 1,300 |  |  |  |
Oncor Electric Delivery Company LLC | Licensing Agreements |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Broadband licenses granted, number of counties | country |  |  |  |  |  |  | 3 |  |  |  |
Long-term contingent consideration |  |  |  |  |  |  | $ 7,000 |  |  |  |
Broadband licenses granted estimated consideration |  | $ 102,500 |  |  |  |  |  |  |  |  |
Oncor Electric Delivery Company LLC | Licensing Agreements For Four Counties |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Broadband licenses granted, number of counties | country |  |  |  |  |  |  |  |  | 4 |  |
Oncor Electric Delivery Company LLC | Licensing Agreements For Four Counties | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Milestone payment received |  |  |  |  |  |  |  |  | $ 34,000 |  |
Proceeds from nontrade receivable |  |  |  |  |  | $ 2,900 |  |  |  |  |
Oncor Electric Delivery Company LLC | Licensing Agreements For Three Counties | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Milestone payment received |  |  |  |  |  |  | 300 |  |  |  |
Proceeds from nontrade receivable |  |  |  |  |  |  | 20 |  |  |  |
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Agreement term (in years) |  |  |  | 20 years |  |  |  |  |  |  |
Number of states in service territory | state |  |  |  | 8 |  |  |  |  |  |  |
Contract with customer liability |  |  |  |  |  |  | 70,900 |  |  |  |
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract with customer liability |  |  |  |  |  |  | 64,100 |  |  |  |
SDG&E |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  | $ 50,000 |  |  |  |  |  |
Contingent consideration, liability, current |  |  |  |  |  |  | $ 1,000 |  | $ 1,000 |  |

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